Cyr graduated from Edouard Montpetit High School in Montreal and attended Seminole State College in Oklahoma. He was drafted by the San Diego Padres in the 30th round of the 1998 MLB draft and signed with the Padres on May 31,. Cyr made his professional debut in 1999, splitting time between the Azl Padres and the Idaho Falls Chukars of the rookie leagues. He played with the Single-A Fort Wayne Wizards in and the Lake Elsinore Storm in. With the Storm he had a terrific season, turning in a record of 7–4 with a 1.61 ERA in 21 appearances and striking out 131 batters while only walking 24. He was promoted to the Double-A Mobile BayBears in, where he was 4–6 with a 3.24 ERA in 14 starts before being promoted to Triple-A Portland. He made his Major League Baseball debut for the Padres on June 23, 2002, against the New York Yankees, working one scoreless inning in relief. He played in 5 games that year, going 0–1 with an ERA of 10.50 in 6 innings of total work. Cyr was claimed off waivers by the Anaheim Angels on March 5, and pitched briefly for the Angels Double-A team in Arkansas before the Angeles waived him and he was claimed by the Cincinnati Reds, who sent him to Chattanooga. After a short stint there, he was returned to the Angels. Cyr pitched for both Arkansas and the Salt Lake Stingers in before leaving the Angels to take part in the 2004 Summer Olympics as part of Team Canada. He also pitched for Salt Lake in, accumulating a record of 5–5, 5.64 in 38 appearances, 9 starts. He was on the Canadian WBC Roster. Shortly before attending the 2006 WBC, he signed with CPBL's Uni-President Lions in Taiwan. He departed the Uni-President Lions in September 2006, leaving a record of 9 wins, 5 losses, and an ERA of 2.52, a WHIP of 1.23 in his 128.2 innings during the 2006 CPBL season. After finishing with the Uni-President Lions, he started one game for the Quebec Capitales of the Canadian-American Association of Professional Baseballgiving up only 4 hits and no walks in eight shut-out innings before quitting the team to join Team Canada at the qualifiers for the 2008 Olympic Games in Beijing, China. In, he signed a minor league contract with the Los Angeles Dodgers, compiling a record of 6–3 with a 3.18 ERA in 16 starts for the Jacksonville Suns before being promoted to the Las Vegas 51s, where he was 3–6 with a 5.56 ERA in 12 games, 11 as a starter. He played winter ball in Venezuela during the off-season and signed a minor league contract with the Texas Rangers for, but was released before the start of the season and signed with the Seattle Mariners; he was assigned to their Triple-A affiliate, the Tacoma Rainiers, but was released on May 2, 2008. After a stint pitching with Quebec of the Canadian AmericanBaseball league, where he was named player of the week ending on May 25, 2008, he was again picked up by the Dodgers and assigned to the Inland Empire 66ers of San Bernardino and later promoted to the Las Vegas 51s. He became a free agent at the end of the season. Early in 2009, he announced that he was planning on joining the Sherbrooke Expos a senior team in the Ligue de baseball senior élite du Québec. He is engaged toalpine skierSara-Maude Boucher and they have two children together. He has another daughter with his first wife named Chloé Cyr.
On January 25, 2001, Cyr was accused of sexually assaulting a minor on an international flight from New Zealand to Los Angeles. Cyr plead guilty to a misdemeanor charge of sexual assault, and served 30 days in jail later that year.
